Changes by Brett Cannon [EMAIL PROTECTED]:
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priority: - immediate
title: Catching all exceptions with 'object' - Raise a Py3K warning for
catching non-BaseException exceptions
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Tracker [EMAIL PROTECTED]
http://bugs.python.org/issue2291
Changes by Brett Cannon [EMAIL PROTECTED]:
--
priority: immediate - urgent
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Tracker [EMAIL PROTECTED]
http://bugs.python.org/issue2291
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Python-bugs-list mailing list
Alexander Belopolsky [EMAIL PROTECTED] added the comment:
I am commenting on issue2371 patch here, so that I does not get lost in
a non-showstopper issue. Taek, please reattach your patch here when you
get a chance.
With the additional -3 logic, code duplication between tuple and
non-tuple
Alexander Belopolsky [EMAIL PROTECTED] added the comment:
There is also a subtle bug in the issue2371 patch:
$ cat x.py
try:
raise ValueError
except ((ValueError,),):
pass
$ ./python -3 x.py
x.py:3: DeprecationWarning: catching classes that do not inherit from
BaseException is not
Alexander Belopolsky [EMAIL PROTECTED] added the comment:
Correction for msg63584: the old/new style difference example should read
class x:
pass
class y(x):
pass
try:
raise y
except y:
print b
except:
print a
As written it prints 'b', but with __metaclass__ =
Guido van Rossum [EMAIL PROTECTED] added the comment:
I finally figured this out. The try/except statement is a complete red
herring; the problem is in the raise statement. The behavior is the
same in 2.4, 2.5 and 2.6, even though Exception is a classic class in
2.4 and a new-style class in
Guido van Rossum [EMAIL PROTECTED] added the comment:
except object: will continue to be a no-op, if only for compatibility.
With -3 it will issue a warning (I just checked this in, from
issue2371). With -3 -Werror it will be an error.
We still need patches to issue -3 warnings for:
- raising
Alexander Belopolsky [EMAIL PROTECTED] added the comment:
On Mon, Mar 17, 2008 at 11:00 PM, Guido van Rossum
[EMAIL PROTECTED] wrote:
..
- raising exceptions that don't derive from BaseException
See patch at issue2341.
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Tracker [EMAIL PROTECTED]
Alexander Belopolsky [EMAIL PROTECTED] added the comment:
On Mon, Mar 17, 2008 at 11:00 PM, Guido van Rossum
[EMAIL PROTECTED] wrote:
We still need patches to issue -3 warnings for:
- __getitem__ or __getslice__ on exception instances
I've opened a separate issue for this (see issue2379).
Guido van Rossum [EMAIL PROTECTED] added the comment:
Thanks!
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resolution: - accepted
status: open - closed
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Tracker [EMAIL PROTECTED]
http://bugs.python.org/issue2291
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